665127936 has 242 divisors, whose sum is σ = 2175707172. Its totient is φ = 201553920.

The previous prime is 665127809. The next prime is 665127949. The reversal of 665127936 is 639721566.

665127936 is a `hidden beast` number, since 66 + 512 + 79 + 3 + 6 = 666.

It is a super-4 number, since 4×665127936⁴ (a number of 36 digits) contains 4444 as substring.

Its product of digits (408240) is a multiple of the sum of its prime divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 665127891 and 665127900.

It is an unprimeable number.

It is a polite number, since it can be written in 21 ways as a sum of consecutive naturals, for example, 60466171 + ... + 60466181.

Almost surely, 2^665127936 is an apocalyptic number.

665127936 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665127936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1087853586).

665127936 is an abundant number, since it is smaller than the sum of its proper divisors (1510579236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665127936 is an frugal number, since it uses more digits than its factorization.

665127936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 16 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 665127936 is about 25790.0743698036. The cubic root of 665127936 is about 872.9078444544.

The spelling of 665127936 in words is "six hundred sixty-five million, one hundred twenty-seven thousand, nine hundred thirty-six".